Add missing returns (#186)

Closes #185

Author: mxr576

src/Storage/FlysystemStorage.php

@@ -44,7 +44,12 @@ public function fetch($key)
      */
     public function save($key, CacheEntry $data)
     {
+      try {
         $this->filesystem->write($key, serialize($data));
+        return true;
+      } catch (FilesystemException $e) {
+        return false;
+      }
     }
 
     /**
@@ -54,6 +59,7 @@ public function delete($key)
     {
         try {
             $this->filesystem->delete($key);
+            return true;
         } catch (FilesystemException $ex) {
             return true;
         }